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However, achieving a Commission Internationale de l'Eclairage y value below 0.05, an exceptional external quantum efficiency (EQE), and a low\u2010efficiency droop in deep\u2010blue emitters presents a significant challenge. Here, the study reports a deep\u2010blue emitting carbon quantum gear rack (DB\u2010CQG) characterized by an emission wavelength of 406 nm and a high quantum yield of 80%. DB\u2010CQG comprises nine benzene rings and four embedded nitrogen\u2010centered tripods and exhibits a quasi\u2010planar configuration that leads to hybridized local and charge\u2010transfer (HLCT) excited\u2010state characteristics. Both experimental investigations and theoretical calculations revealed the activation of the reverse intersystem crossing channel between the high\u2010lying triplet state and lowest excited singlet state in DB\u2010CQG via hot\u2010exciton mechanism. DB\u2010CQG exhibits characteristic HLCT behavior with deep\u2010blue emission owing to the partial overlap of holes and electrons, which is facilitated by the formation of nitrogen\u2010centered tripods in the quasi\u2010planar configuration. The electroluminescent light\u2010emitting diodes (LEDs) fabricated using DB\u2010CQG exhibit a deep\u2010blue color with chromaticity coordinates of (0.158, 0.048), a maximum luminance of 4560 cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , and an EQE of 10.45%, which is one of the highest reported efficiencies for solution\u2010processable deep\u2010blue LEDs.\n                  <\/jats:p>","DOI":"10.1002\/adma.202510604","type":"journal-article","created":{"date-parts":[[2025,7,25]],"date-time":"2025-07-25T06:51:52Z","timestamp":1753426312000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Deep\u2010Blue Electroluminescent Light\u2010Emitting Diodes with Efficient Hot\u2010Exciton Emission from Carbon Quantum Gear Rack"],"prefix":"10.1002","volume":"37","author":[{"given":"Yuyi","family":"Han","sequence":"first","affiliation":[{"name":"Key Laboratory of Theoretical &amp; Computational Photochemistry of Ministry of Education College of Chemistry Beijing Normal University  Beijing 100875 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianzhi","family":"Song","sequence":"additional","affiliation":[{"name":"Key Laboratory of Theoretical &amp; 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